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Titolo:
Two and three component photoinitiating systems based on coumarin derivatives
Autore:
Allonas, X; Fouassier, JP; Kaji, M; Miyasaka, M; Hidaka, T;
Indirizzi:
Ecole Natl Super Chim, Dept Photochim Gen, UMR 7525, F-68093 Mulhouse, France Ecole Natl Super Chim Mulhouse France F-68093 , F-68093 Mulhouse, France Hitachi Chem Co Ltd, Ctr Res & Dev, Hitachi, Ibaraki 3178555, Japan Hitachi Chem Co Ltd Hitachi Ibaraki Japan 3178555 Ibaraki 3178555, Japan
Titolo Testata:
POLYMER
fascicolo: 18, volume: 42, anno: 2001,
pagine: 7627 - 7634
SICI:
0032-3861(200108)42:18<7627:TATCPS>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
COMPLEX AMINE SYSTEM; DYE; PHOTOPOLYMERIZATION; POLYMERIZATION; HEXAARYLBIIMIDAZOLE; PHOTODISSOCIATION;
Keywords:
coumarin; ketocoumarin; photosensitizer;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
22
Recensione:
Indirizzi per estratti:
Indirizzo: Fouassier, JP Ecole Natl Super Chim, Dept Photochim Gen, UMR 7525, 3 Rue Alfred Werner, F-68093 Mulhouse, France Ecole Natl Super Chim 3 Rue Alfred Werner Mulhouse France F-68093
Citazione:
X. Allonas et al., "Two and three component photoinitiating systems based on coumarin derivatives", POLYMER, 42(18), 2001, pp. 7627-7634

Abstract

This study shows that several coumarin or ketocoumarin/additives combinations (bisimidazole derivative, mercaptobenzoxazole, titanocene, oxime ester)are able to initiate quite efficiently a radical polymerization reaction. The interactions between the excited states of coumarins or a ketocoumarin and various additives have also been studied by laser absorption spectroscopy, time resolved fluorescence and photoconductivity; the redox potentials of these different compounds have been measured and allowed the calculationof free enthalpy variations for a possible electron transfer reaction. Thewhole results explain the interaction mechanism and show that the coumarins are able to form radicals through an electron transfer reaction with the different additives whereas the ketocoumarin leads to an energy transfer with bisimidazole and to an hydrogen abstraction with the benzoxazole derivative. (C) 2001 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/04/20 alle ore 12:00:46